84329B DATA SHEET

700MHZ, LOW JITTER, CRYSTAL-TO-3.3V LVPECL

FREQUENCY SYNTHESIZER

11

REVISION B 07/29/14

Termination for 3.3V LVPECL Outputs

The clock layout topology shown below is a typical termination for

LVPECL outputs. The two different layouts mentioned are

recommended only as guidelines.

The differential output is a low impedance follower output that

generate ECL/LVPECL compatible outputs. Therefore, terminating

resistors (DC current path to ground) or current sources must be

used for functionality. These outputs are designed to drive 50



transmission lines. Matched impedance techniques should be used

to maximize operating frequency and minimize signal distortion.

Figures 6A and 6B show two different layouts which are

recommended only as guidelines. Other suitable clock layouts may

exist and it would be recommended that the board designers

simulate to guarantee compatibility across all printed circuit and clock

component process variations.

Figure 6A. 3.3V LVPECL Output Termination

Figure 6B. 3.3V LVPECL Output Termination

R1

84



R2

84



3.3V

R3

125



R4

125



o =50

o =50

LVPECL

Input

3.3V

3.3V

+

_